The quote you have put there says nothing about binaries, only the source code. And indeed the source code has essentially no reproduction cost since it's downloadable via the Internet without charge as it's preferred.
>you sell them a version for which the source code is not freely available
But the source code IS freely available. All the nagware/restrictions/whatever is in there as a build option. Play Store builds have them enabled unless you buy a license, F-Droid & GitHub builds have them disabled.
In any case it seems you're mistaken about what free software exactly entails, and what is and is not allowed by GPL. For a TL;DR refer to the ones behind it.
>You are allowed to sell copies of the modified program commercially, but only under the terms of the GNU GPL. Thus, for instance, you must make the source code available to the users of the program as described in the GPL, and they must be allowed to redistribute and modify it as described in the GPL.
>you sell them a version for which the source code is not freely available
But the source code IS freely available. All the nagware/restrictions/whatever is in there as a build option. Play Store builds have them enabled unless you buy a license, F-Droid & GitHub builds have them disabled.
In any case it seems you're mistaken about what free software exactly entails, and what is and is not allowed by GPL. For a TL;DR refer to the ones behind it.
https://www.gnu.org/licenses/gpl-faq.en.html#GPLCommercially
>You are allowed to sell copies of the modified program commercially, but only under the terms of the GNU GPL. Thus, for instance, you must make the source code available to the users of the program as described in the GPL, and they must be allowed to redistribute and modify it as described in the GPL.